Investment Securities - Summary of Debt Securities Available for Sale and Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Estimated Fair Value
Less than 12 Months	$ 8,830	$ 10,395
12 Months or Greater	33,342	39,239
Total	42,172	49,634
Unrealized Losses
Less than 12 Months	(201)	(223)
12 Months or Greater	(5,671)	(5,792)
Total	(5,872)	(6,015)
FHLMC Bonds
Estimated Fair Value
Less than 12 Months	2,981	3,194
12 Months or Greater	13,043	16,053
Total	16,024	19,247
Unrealized Losses
Less than 12 Months	(83)	(58)
12 Months or Greater	(2,051)	(2,135)
Total	(2,134)	(2,193)
GNMA Bonds
Estimated Fair Value
Less than 12 Months	2,055	2,264
12 Months or Greater	1,263	1,852
Total	3,318	4,116
Unrealized Losses
Less than 12 Months	(6)	(24)
12 Months or Greater	(3)	(28)
Total	(9)	(52)
FNMA Bonds
Estimated Fair Value
Less than 12 Months	3,106	3,329
12 Months or Greater	12,579	15,762
Total	15,685	19,091
Unrealized Losses
Less than 12 Months	(75)	(29)
12 Months or Greater	(2,175)	(2,293)
Total	(2,250)	(2,322)
Municipal Bonds
Estimated Fair Value
Less than 12 Months	688	1,608
12 Months or Greater	6,457	5,572
Total	7,145	7,180
Unrealized Losses
Less than 12 Months	(37)	(112)
12 Months or Greater	(1,442)	(1,336)
Total	$ (1,479)	$ (1,448)